Summary of Changes in Accumulated Other Comprehensive Income (Loss) by Component (Parenthetical) (Detail) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Derivatives
Accumulated Other Comprehensive Income (Loss) [Line Items]
Unrealized gains (losses), net of tax	$ (2)	$ 7
Net change related to other comprehensive income (loss), tax	(1)	(3)
Investments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Unrealized gains (losses), net of tax	185	297
Net change related to other comprehensive income (loss), tax	183	296
Translation adjustments and other
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net change related to other comprehensive income (loss), tax	$ 0	$ 0